Steam-boiler furnace



(No Model.) 3 Sheets-Sheet 1 T. W. DEFREES.

STEAM BOILER FURNACE. No. 248,411. 181811188 0 1. 18,1881.

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(No Model.) S'Sheets-Sheet 2.

T. W. DEFREES.

STEAM BOILER FURNACE.

,411. Patented Oct. 18,1881.

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3 Sheet-Sheet 3. T. W. DEFREES.

STEAM BOILER FURNACE.

, Patented Oct. 18.1881.

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IINTTE STATES THOMAS W. DEFREES, OF SOUTH BEND, INDIANA.

STEAM-BOILER FURNACE.

SPECIFICATION forming part of Letters Patent No. 248,411, dated October 18, 1881.

Application filed July 19, 1881. (No model.)

To all whom it may concern Be it known that I, THOMAS WVILK DE- FREES, a citizen of the United States, residing at South Bend, in the county of St. Joseph and State of Indiana, haveinvented Improvementsin Steam-Boiler Furnaces, ot'which the following is a specification.

This invention consists in forming a steamboiler and furnace in four se ctionsthe base or ash-pit, the grate and the bed-plate forming the first section a round upright tubular boiler having a water-leg supporting it upon the bed -plate, and a waterarm extending above the head of the boiler, forms the second section 5 a movable coal-hopper placed on the inside and upon the top of the boiler, and connecting with a tube that passes down through the water to the fire-chamber, the third section; a cast-iron movable lid placed above and over the boiler, covering it, and connecting with a doublejacket of sheet-iron, the fourth section. Theinsidejacket extends down on the outside of the boiler near the bedplate, forming between said jacket and boiler an annular descending flue for the escaping products of combustion, completely surrounding the boiler. The products of combustion escaping from this annular flue near the bedplate, deliver most of their remaining heat to the water-leg resting thereon and escapes between the two jackes to the smoke-stack. An annular air-chamber between the lid and the lower walls of the coal-hopper protects the coal above from the direct heat of the tire.

In the accompanying drawings, Figure 1 is a side view of my improved furnace. Fig. 2 is a vertical section on the line 2 2, Fig. 8. Fig. 3 is a horizontal section on the line 3 3, Fig. 2.

1 represents the ash-pit, on the top of the cylindrical wall of which the bed'plate 2 is supported. Upon the said bed-plate are supported, first, the grate 3, resting in shoulders in the bed-plate, second, an annual water-leg, 4, of a vertical tubular boiler, 5; third, the outer jacket or casing, 6, of the furnace. The water-leg and casing are held in place on the bed-plate by resting between flanges 7 formed or riveted thereon.

Between the grate 3, the crown-sheet S, and the inner wall of the annular water-legetis sit uated the fire-chamber, to which access is had by door9 in the side or front of the furnace.

In the center of the boiler 5 is a large tube or passage, 10, connecting the fire-chamber with the removable magazine or hopper 11, which rests above the boiler within the removable annular lid or top 12, the said lid being supported by four brackets resting upon the top of the steam-chamber, and near its inner edge by a frusto-conical collar, 13, resting on the top of the boiler.

Between the collar 13 and the lower converging portion of the magazine is formed an air-chamber, 14, which serves to protect the coal in the magazine from the direct heat of the furnace.

A steam-chamber is provided by extending the outer portion of the boiler up into the hotair chamber 15, as shown at 16, and the annular chamber thus formed serves not only as a reservoir for steam, but by keeping some inches of water constantly in the same the boiler itself is kept constantly full of water and injury to boiler-topv by fire is effectually prevented.

The inclined form of the collar 13, sloping upward and outward from the base of the coal-hopper tov near the top of the water-arm 16, serves to deflect the heated products of combustion, concentrating the greatest heat' of the furnace on the said water-arm, which contains the hottest water and the steam of the boiler.

To provide for the more complete exhaustion of the heat of the products of combustion and that the same whenin their most exhausted state shall reach the coolest portion of the boiler, I place between the outer wall of the boiler and the outerjacket, 6, an innerjacket, 1S, reaching from the lid 12 nearly to the bedplate, forming a descending-flue, 19, through which the escaping products of combustion must pass before reaching the outer ascending flue, 20, and the smoke-stack 21. Thefurnace is thus formed in five com plete and easily-separable sections-first, the ash-pit l, bed-plate 2, and grate 3; second, the upright tubular boiler 1 5 16; third, the movable coal-hopper 11; and fourth, the annular lid 12, collar 13, and outer and innerjackets or casings, 6 18.

I claim a superiority of my invention over all other similar oncsfirst, from its general make up and construction, having a water-leg extending down to and resting on the bedplate and around and over the grate, forming a fire-chamber, and a water-arm extending up and above the head of the boiler, thus forming a reservoir for a surplus of water and a space for steam. The heads of the boiler and flues are thus protected from the action ofthe fire by the pressure or weight of the water in the arm, holding a column of water up against them at all times, the fire-chamber being within the annular water-leg and beneath the head of the boiler, with ascending fines passing through the water to the air-chamber at top.

Forlarge boilers I also make ascending does 22, connecting with the side wall of the firepot and passing up through the water in the shell of the boiler to the air-chamber above, as shown in dotted lines in Fig. 2.

I further claim the superiority of my invention over all others from its being composed of four separate sections, each or allot which may be detached in a few moments and exposed for repairs or cleaning.

Having thus described the various details of my invention, what I claim, and desire to secure by Letters Patent, is-- 1. In combination with a boiler having internal tubes or fines and an external annular descending flue, the annular water-arm ex tending up into the hot-air chamber, and an inclined collar arranged to deflect the heat onto the said water-arm, as shown.

2. The combination of an upright tubular boiler having a water-leg resting on the bedplate, and a movable coal-hopper having a neck extending within a central tube of the boiler, a i'rusto-conical portion between the said neck and the furnace-top, and a circular shoulder, whereby the hopper is seated on the furnace, as shown.

3. The combination ofan upright boiler having a water-leg resting on the bed-plate, ascending flues passing up through the water in the boiler to a hot-air chamber at top, and a central coal-feeding tube, an annular descending flue between the inner jacket and outer surface of the boiler to near the foot of the water-leg, and an outer annular flue formed between the outer and inner jackets, as shown.

4. The combination of an upright tuoular boiler having a central coal-feeding tube, the frusto-conical collar resting on the boiler-head, an annular lid resting on the said collar, and a removable coal-hopper of less diameter than the said collar, said collar and hopper forming, when in place, an annular air-space to protect the coal from direct heat, as set forth.

5. The combination of a movable coal hopper, an upright tubular boiler having an annular water-leg resting on the bed-plate and surrounding and covering the grate thus forming the fire-chamber, a movable cast-iron lid covering the boiler and connecting with a double metallicjacket, and the outside jacket connecting the lid with the flange ofbed-plate, thus inclosing the whole in one solid case.

In testimony whereof I have hereunto set my hand this 11th day of July, A. I). 1881.

THOMAS W. DEFREES.

\Vitnesses:

J. M. ADIRE, E. E. WELLs. 

